Combination-tool for boring and tapping.



No. 758,088. PATENTED APR. 26, 1904.

J. H. ALLBNDORFBR & M. OWENS.

COMBINATION TOOL FOR BORING AND TAPPING.

APPLIQATION FILED SEPT. 5, 1902.

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J. H. ALL ENDORFERV& M. OWENS. COMBINATION TOOL FOB/BORING AND TAPPING.

APPLIOATION IILED SEPT. 5, 1902.

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PATENTED APR. 26, 1904.

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UNITED STATES Patented April 26, 1904.

PATENT OFFICE.

JOHN H. ALLEN'DORFER, OF BOROUGH OF WESTMONT, AND MOSES OWVENS, OF JOHNSTOWN, PENNSYLVANIA.

COMBINATION-TOOL FOR BORING 'AND TAPPING.

SPECIFICATION forming part of Letters Patent No. 758,038, dated April26, 1904. Application filed September 5,1902, Serial No. 122,184. (Nomodel.)

lowing to be a full, clear, and exact descr'iption of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

Our invention relates to combination-tools for boring and tapping whichare provided with reaming-cutters in addition to the threading-dies, soas to ream or clean out the hole to be tapped in advance of thethreading-dies, and in which said dies may be withdrawn when the work isfinished.

Certain objects of our invention are to provide an apparatus that willoperate as above described, simple and cheap in construction, effectivein use, and capable of performing its duty in the minimum time; and tothese ends our invention consists of certain novel features, which wewill proceed to describe and hereinafter particularly point out in theclaims.

Our improved combination-tool consists, primarily, of a hollow stock ordie-holder having longitudinal radial slots for removably holding thecutting-dies and parallel grooves for holding reamingcutters placedtherein. Within said hollow stock or die-holder is a mandrel cylindricalat its upper end and taper: ing at its lowerextremity, said tapering endhaving longitudinal inclined splines for engaging with correspondinggrooves or rabbets in the threading-dies, this arrangement thus servingto removably secure and adjust said dies in various positions asdesired. Two pins, each formed of a separate round piece flattened atits outer extremity, rest in a cylindrical hole provided in the upperportion of the mandrel, and said flattened ends project so as to engagea square screw-thread or cam-surface cut in a sleeve or nut, which isfree to revolve around the hollow stock or die-holder aforesaid. Saidpins and sleeve cooperate to set said mandrel for adjusting thethreading-dies outwardly or inwardly and for collapsing said diesprevious to withdrawing the tool.

The sleeve or nut before mentioned is provided at each end with a flatcollar or washer the inside diameter of which is less than that of thesleeve, while the hollow stock or dieholder on which it is mounted isprovided with corresponding circumferential grooves in which the inneredges of said collars or washers engage, so that said collars whileforming part of and revolving with said sleeve or nut also prevent itsmovement in the direction of the axis of the stock or die-holder. Thepins referred to, however, are adapted to travel longitudinally of theaxis of said stock or dieholder, but are limited to this motion by thesides of the slots formed in the said stock or die holder through whichthey project. Therefore when the sleeve or nut is given the rotarymotion above mentioned the pins are caused to move longitudinally of thestock or die-holder, thus carrying with them the mandrel, which by meansof its tapering and splined end causes the threading-dies to contract orexpand as the said mandrel is moved up or down.

An adjustable stop is provided to limit the downward motion of the pinsand the mandrel carryingthem, thereby restricting the expansion of thethreading-dies to the diameter desired. This adjustable stop consists ofan oblong body portion provided with a longitudinal cylindrical hole inwhich a screw-threaded stud is arranged, said stud being provided with alongitudinal slot or keyway, cooperating with a corresponding set-screwlocated in the body portion of thestop for the purpose ,ofpreventing therotation of said stud. Said screw-threaded stud is further provided with-a cylindrical nut mounted in the body portion ofthe stop, therevolution of which moves and adjusts said stud as desired, and as saidstud is arranged in the line of travel of the pins aforesaid itsadjustment thus limits the downward motion of said pins to any degreedesired.

We also provide a number of shells of approximately annular section madeof various external diameters to carry taps or threadingdies ofdifferent radial'lengt-hs, corresponding with the various standard sizesof internal screw-threads, each of said shells being of the sameinternal diameter, equal to the external diameter of the hollow stock ordie-holder, which thus adapts them for use on the same stock, so that achange from a smaller to a larger size of tapping or threading dies, orvice versa, can be made in a simple manner and in a very short time.

Having thus given a general description of our invention, we will now inorder to make the matter more clear refer to the annexed two sheets ofdrawings, which form part of this specification, and in which likefigures refer to like parts.

Figure 1 is a front elevation of our combination-tool. Fig. 2 is acentral vertical sectional elevation of the same. Fig. 3 is an enlargedtransverse sectional plan on the line A B of Fig. 2 looking in thedirection of the arrows. Fig. 4 is an adjustable stop for use in settingthe dies to a given diameter. Fig. 5 is a vertical front elevation ofthe lower part of our tool, showing an auxiliary shell secured thereon.Fig. 6 is a transverse section of and looking upwardly at arepresentative one of said shells, and Fig. 7 is a central verticalsection through the sleeve or nut.

Referring now to the Various characters of reference upon the drawings,1 is a hollow stock or die-holder provided with longitudinal slotsradially arranged and parallel grooves for carrying threading-dies andreaming-cutters, respectively.

. 2 is a mandrel having a tapering end of special form, said mandrelbeing adapted to travel lengthwise within the stock or die-holder 1.

3 represents threading-dies having inclined inner edges and providedwith slotted grooves in their sides adjoining and parallel to theinclined edges.

4 is a sleeve or nut provided with interior screw-threads, said sleeve.or nut being revolubly mounted on the stock or die-holder 1.

5 represents-thin collars or washers, each composed of two semi-annularpieces,attached to the sleeve or nut 4, which washers work incircumferential grooves in the stock or dieholder 1 to prevent thesliding or longitudinal movement of said sleeveor nut, 4thereon.

6 represents square screw-threads on the interior of the sleeve or nut4, and 7 represents screws for fastening the collars or washers 5 to thesleeve or nut 4. The upper portion of the stock or die-holder 1 isprovided with a hollow head having a keyway therein adapted to fit inthe usual manner on a drill or lathe splndle.

8 represents pins revolubly mounted in the mandrel 2, the ends of whichpins are flattened and pro ect from said mandrel within thescrew-threads 6, as shown.

9 represents vertical radial slots in the stock or die-holder 1, throughwhich the pins 8 project, as shown. It will be noted that the pins 8,while actually in line with each other, are composed of two separatepieces, each flattened at its outer extremity for the purpose ofengaging the cam or threaded surface 6 of the sleeve or nut 4, as beforementioned. This is a very valuable improvement, as it permits each endof said pins to adapt itself to the angle or inclination of the threador cam surface irrespective of the other pin, thus conducing to ease inmanipulation, as with one solid pin it would be necessary to carefullycut the thread 6 and still more carefully adjust the ends of the pin tothe inclination of said thread in order to prevent binding, which latternever ocours in our improved arrangement of separate and individualpins.

Referring to the radial vertical slots 9, which are formed within thehollow stock or dieholder 1 and in which said pins 8 are adapted totravel vertically, said slots 9 are each provided withan approximatelysemicircular recess 25, which allows a limited horizontal movement ofthe pins 8 at this point. As shown in Figs. 1 and 7, it will be notedthat the thread or cam surface 6 is prolonged through half of the lowercollar 5, stopping abruptly at the surface 26 of the other collar,

at the junction of the two halves thereof.

These arrangements provide means for unlocking the dies when it isdesired. to remove them to allow a shell to he slipped on or for someother reason. To accomplish this, we first remove the adjustable stop,then turn the sleeve or nut 4 to the right until the pins 8, followingthe thread 6, 'move downward until they reach. the end of said thread.At this point the flat surface 26 of theadjoining half of the lowercollar 5 abuts against the pins 8 and carries them around into thesemicircular recess 25, above referred to. This latter motion of thepins 8 causes the mandrel to turn within the hollow stock or die-holderin the direction shown by the arrow in Fig. 3, thus effectivelyunlocking the dies 3, which can then be pulled out Without furthermanipulation.

10 is the body portion of the adjustable stop used for setting the diesto various diameters.

11 is a screw-threaded stud which slides within the body of the stop 10.

12 is a longitudinal slot or keyway inthe stud 11.

13 is a set-screw. the end of which serves as 16 representsreaming-cutters mountedon in order to enable our combination-tool tocut,

the forward or cutting end of the stock or dieholder 1. 17 representsother reaming-cutters mounted upon said stock or die-holder 1 betweenand parallel to the threading-dies 3.

24 is a shell of approximately annular section provided with grooves, asindicated in Figs. 5 and 6, the illustration of said shell being merelyrepresentative, as various similar ones of different sizes and diametersare used threads of all sizes, as will be readily understood. I

18 represents longitudinal grooves in the exterior of the shell 24 forholding reaming-cutters similar to those marked 16 and 17 19 representsradial slots cut through the body of the shell 24L for the passage ofthe threading-dies. V l

20 represents longitudinal grooves provided 20 in the interior surfaceof the shell 24 for allowing it to be slipped upon the stock ordieholder 1 without removing the reamingcut ters 16 and 17 21 representsset-screws for securing the 25 shell 24 to the stock or die-holder 1.

22 represents reaming-cutters (shown in Fig. 5) mounted on the forwardor cutting end of the shell 24, said reaming-cutters being similar tothose marked 16 in Figs. 1 and 2, and 23 represents reaming-cuttersmounted on the shell 2 1 between the threading-dies, as shown in Fig. 5,said reaming-cutters 23 being similar to those marked 17 in Fig. 1.

i It will be noted that the reaming-cutters 16 3 5 are mounted on theforward or cutting end of the mandrel, so as to bore out the hole to betapped in advance of the threading-dies. V In operation of tools of thischaracter it is often found that the teeth of the threading-dies are 4broken away by the sharp edges of the thread striking the base of thecutting-teeth, to prevent which we provide another set ofreamingcutters, 17 or 23, arranged one between each pair ofthreading-dies 3, the cutting edges of 4 5 which reaming-cutters extenda small fraction of an inch farther from the axis of the tool than thatpart of the tapping-dies which forms the apex of the threads, asindicated in Fig.

3, with respect to the reaming-cutters 17, so

5 that they merely shave the sharp edges of the threads, and thusaccomplish the desired resultnamely, to prevent breakage and prolong thelife of the threading-dies.

Referring to the adjustment of the threading-dies, it will be understoodthat the primary purpose of making them adjustable outwardly is tocompensate for the reductionin diameter occasioned by the wear of saiddies and their sharpening from time to time, an-

50 other object being to allow for the different sizes, as is necessarywhen retapping wornout flange-couplings or the like.

To facilitate the escape of the cuttings, the hollow stock or die-holder1 is cut away or fluted on its circumference at the side of each dieandreaming-cutter, as shown in Figs. 1 and 3.

Referring to the representative shell shown in cross-section in Fig. 6and in position in Fig. 5, these shells are provided with two sets ofreaming-cutters similar to those used on the hollow stock'l and intendedto perform the same functions, said reaming-cutters being located withmthe grooves 18, while the threading-dies pass through the slots 19. The

inner surfaces of the shells are providedwith grooves, as shown at 20,to allow .them to be slipped over the hollow stock or die-holder 1without removing. the reaming-cutters which are secured thereon, and itwill also be noted that the shells are grooved or fluted longitudinallybetween the reaming-cutters and dies for the purpose of giving clearanceand allowing the escape of the cuttings. The diameter of the shells maybe greater than that of the one shown for the purpose of supporting andholding larger dies, so as to increase the diamcter of the tool, and itwill also be understood in this connection that the same stock ordie-holder may be used with various sizes of shells, so that while thetool is madeof standard sizes as regards the shells and lengths of thedies the same stock will answer for various sizes, thusprovidinganapparatus consisting of few parts, but at the same timecovering a wide range of use.

By means of the improvements as described herein we can change andadjust the diameter of our tool from the smallest to the largest, orvice versa, in a very short time, as may be readily understood.

Although we have shown our improvements in considerable detail, we donot limit ourselves to the exact and specific particulars of thearrangement or forms shown and described, but may use suchsubstitutions, modifications, or equivalents thereof as are embracedwithin the scope of our invention and as pointed out the threadingdiesaforesaid, a rotatable internally-threaded sleeve mounted on said hollowstock, projections on said mandrel cooperating with said internalthreads whereby the mandrel may be adjusted longitudinally by therevolution of said sleeve, vertical ra dial slots in said hollow stockthrough which said projections extend and are guided, a recess in theside of each of said radial slots for allowing a limited lateralmovement of the projections aforesaid, a flat or stop surface at theends of said internal threads whereby the said projections may becarried into the said recesses by the revolution of the sleeve, therebyunlocking the dies from the mandrel by the partial revolution of thelatter.

2. In a combination-tool for-boring and tapping, an internal mandrelprovided with a tapering end for adjusting the threading-dies, the upperportion of said mandrel being provided with a transverse cylindricalhole in which are mounted two pins each composed of a cylindrical pieceflattened at its outer extremity for and in engagement with the internalthreads of an adjusting-nut mounted upon a hollow stock or die-holdercontaining said mandrel.

3. In a combination-tool for boring and tapping, a series of adjustablethreading-dies mounted on a hollow stock, amandrel mounted within saidhollow stock and provided with. a tapering end in operative connectionwith said dies, a rotatable sleeve provided with interior screw threadsand mounted on said stock, said sleeve having at each end a flat collarformed of two separate semi-annular pieces the interior surfaces ofwhich are fitted within corresponding circumferential grooves formed inthe periphery of the stock aforesaid, pins mounted in and projectingfrom said mandrel and engaging with said screwthreads, whereby thethreading-dies are adjusted by the revolution of said sleeve.

4:. In a combination-tool for boring and tapping, a hollow stock,adjustable threadingdies mounted therein, a mand rel provided with atapering end mounted within said hollow stock, said tapering end beingarranged to cooperate with and adjust the threading-dies aforesaid, anadjustable stop mounted upon said stock; said stop being composed of abody portion and a screw-threaded stud adapted to move longitudinallytherein, and means for adjusting said stud whereby the movement of saidmandrel is limited as desired.

5. In a tool for boring and tapping, aseries of threading-dies mountedupon a hollow stock, an internal adjusting-mandrel mounted therein, anadjustable stop mounted in said stock and cooperating with a projectingportion of said mandrel; said stop being composed of a body portionsecured to said hollow stock, a screw-threaded stud provided with alongitudinal slot and adapted to move lengthwise within said bodyportion, a setscrew projecting within the slot aforesaid, and a nut foradjusting or setting the screw-threaded stud, whereby the longitudinalmovement of the said mandrel is limited as desired.

6. In a tool for boring and tapping provided with a series of adjustablethreading-dies mounted upon a hollow stock, a mandrel having a taperedend arranged to cooperate with and adjust the threading-dies aforesaid;an adjustable stop composed of a body portion removably secured to saidhollow stock, a screw-threaded stud mounted .on said body portion andprovided with a longitudinal slot, a set-screw projecting within saidslot, a circular nut threaded upon said stud and mounted within theframework of said body portion, said screw-threaded stud being locatedin the line of travel of a projection on said mandrel whereby themovement of the same may be limited as desired. 1

7. In a combination-tool for boring and tapping, a hollow stock providedwith external longitudinal grooves, a series of adjustablethreading-dies mounted within radial slots in said hollow stock, amandrel mounted within said hollow stock and provided with a taperingend having splines or projections to cooperate with correspondinginclined grooves near the inner edges of said threading-dies, aninternally threaded rotatable sleeve mounted on said hollow stock andprovided at each V end with a fiat collar formed of two separatesemi-annular pieces the interior edges of which project withincircumferential grooves cut in the periphery of the hollow stockaforesaid, the upper portion of said mandrel being provided with atransverse cylindrical hole in which are mounted two pins each composedof a cylindrical piece flattened at its outer extremity for engagementwith the internal screw-threads of the sleeve aforesaid; an adjustablestop mounted upon said hollow stock and arranged in the line of travelof one of said pins whereby the adjustment of said dies is made asdesired, by revolving said sleeve until said adjustable stop limits themovement of said mandrel.

8. In a combination-tool for boring and tapping, a hollow stock, aseries ofmova ble threading-dies mounted therein, an adjusting-mandrelprovided with. a tapering end having splines or projections cooperatingwith corresponding inclined grooves near the inner edges of saidthreading-dies, atransverse cylindrical hole in the upper portion ofsaid mandrel in which are mounted two projecting pins, radial slots insaid hollow stock in which said pins are adapted to move vertically,said radial slots being provided with recesses at one side for allowinga limited lateral movement of the pins aforesaid, whereby said mandrelis disengaged from the threading-dies allowing their withdrawal. 7

9. In a combination-tool for boring and tapmandrel, vertical radialslots in said hollow stock through which said pins project and areguided, recesses in the sides of each of said radial slots, whereby saidmandrel is unlocked from the threading-dies when it is turned to bringsaid pins within said recesses.

10. In a combination-tool for boring and tapping, ahollow stock, aseriesof adjustable threading-dies mounted therein; a mandrel located withinthe axial opening of said stock and having a tapering end provided withlongitudinal splines or projections for cooperating with correspondinginclined grooves near the inner edges of said threading-dies, transversepins mounted in the upper portion of said mandrel, vertical radial slotsin said hollow stock through which said pins project and are guided,recesses in the sides of each of said radial slots for allowing alimited lateral movement of the pins aforesaid therein, a rotatablesleeve mounted on said hollow stock and provided with internalscrew-threads engaging the ends of the pins aforesaid, a fiat surface atthe lower ends of said threads adapted to carry the transverse pinslaterally into the before-mentioned recesses thereby turning saidmandrel through a fraction of a revolution and unlocking its splined endfrom the threading-dies aforesaid.

11. In a combination-tool for boring and tapping, a hollow stock ordie-holder, with reaming-cutters projecting therefrom, an annular shellmounted upon said stock and provided with external longitudinal grooveshaving two sets of reaming-cutters mounted therein, one in advance ofthe other, and

meafis for securing said shell upon said hollow stoc 12. In acombination-tool for boring and tapping, ahollow stock or die-holder,with reaming-cutters projecting therefrom, an annular shell removablysecured upon said stock and provided with external longitudinal grooveshaving two sets of reaming-cutters mounted therein, one in advance ofthe other, said shell being also provided with internal longitudinalgrooves that fit over the reamingcutters which are mounted upon theexterior of the hollow stock or die-holder.

13. In a combination-tool for boring and tapping, a hollow stockprovided with radial slots, an annular shell mounted upon said hollowstock and provided with radial slots registering with those of thehollow stock aforesaid, adjustable threading-dies located within saidradial slots; a tapering mandrel mounted within the axial opening ofsaid hollow stock in operative connection with the threading- JOHN H.ALLENDORFER. MOSES OWENS.

Witnesses:

J. R. WEMLINGER, STONE EDELEN.

